Wiktionary
methylglyoxal
n. (context organic compound English) The aldehyde form of pyruvic acid.
Wikipedia
Methylglyoxal
Methylglyoxal, also called pyruvaldehyde or 2-oxopropanal, is the organic compound with the formula CHC(O)CHO. Gaseous methylglyoxal has two carbonyl groups, an aldehyde and a ketone but in the presence of water, it exists as hydrates and oligomers. It is a reduced derivative of pyruvic acid.